Table 1 Estimates of the prevalence of risky drinking in the week prior to survey by sex, wave and phase
Risky drinking | Male | Female | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|
(N = 943) | (N = 1000) | (N = 1943) | |||||||
Number | Percentage | (95 % CI) | Number | Percentage | (95 % CI) | Number | Percentage | (95 % CI) | |
by wave | |||||||||
Wave 1 (mean age 14.9 years) | 81 | 9 | (6–11) | 62 | 6 | (4–8) | 143 | 7 | (6–9) |
Wave 2 (mean age 15.4 years) | 149 | 16 | (13–18) | 78 | 8 | (6–10) | 227 | 12 | (10–13) |
Wave 3 (mean age 15.9 years) | 174 | 18 | (16–21) | 103 | 10 | (8–12) | 277 | 14 | (13–16) |
Wave 4 (mean age 16.3 years) | 212 | 22 | (20–25) | 140 | 14 | (12–16) | 352 | 18 | (16–20) |
Wave 5 (mean age 16.8 years) | 267 | 28 | (25–32) | 152 | 15 | (13–18) | 419 | 22 | (19–24) |
Wave 6 (mean age 17.4 years) | 298 | 32 | (28–35) | 151 | 15 | (13–17) | 449 | 23 | (21–25) |
by phase | |||||||||
In early adolescence (waves 1&2) | 186 | 20 | (17–23) | 111 | 11 | (9–13) | 296 | 15 | (13–17) |
In late adolescence (waves 3–6) | 470 | 50 | (46–53) | 324 | 32 | (29–36) | 794 | 41 | (39–43) |
In adolescence (waves 1–6) | 499 | 53 | (49–57) | 354 | 35 | (32–39) | 853 | 44 | (41–46) |